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Jiahui Zhang,Lili Zhang,Shouyong Zhou,Haiqun Chen,Hui Zhong,Yijiang Zhao,Xin Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A magnetically recoverable composite photocatalyst was obtained by introducing TiO2–FexOy hybrid oxide onto the surface of attapulgite via an in-situ deposit technique (marked as ATT–TiO2–FexOy-r, r represents molar ratio of r = nTi/(nTi + nFe)). The obtained composites were carefully characterized and results showed TiO2–FexOy particles with an average size of 10 nm were successfully loaded onto attapulgite fibers’ surface. The FexOy (mixture of Fe2O3 and Fe3O4) acted not only as magnetic source but also took part in the formation of TiO2–Fe2O3 heterojunction structure, which resulted in the obvious absorption in visible light region for the obtained ATT–TiO2–FexOy. The obtained ATT–TiO2–FexOy-r exhibited quite good catalytic activity towards photodegradation of methyl orange under visible light irradiation. The highest degradation ratio and COD removal of methyl orange reached to 94.13% and 90.91% for ATT–TiO2–FexOy-0.5. Moreover, ATT–TiO2–FexOy could be readily recovered and the degradation ratio maintains 83.89% after 5 cycles. Possible mechanism for this enhancement was proposed.
JIAHUI ZHANG,Lili Zhang,JIN HUANG,Shouyong Zhou,Haiqun Chen,WEIGUANG ZHANG,Xin Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Palygorskite (denoted as Pal) was used as an economical carrier of hybrid photocatalystTiO 2 – FexOy via an in situ depositing technique (marked as Pal – TiO 2 – FexOy). The samples werecharacterized by X-ray di®raction (XRD), transmission electron microscopy (TEM), brunner-emmet-teller (BET) measurements, X-ray photoelectron spectroscopy (XPS) and UV-Vis di®usere°ectance spectra measurements. Results showed that TiO 2 – FexOy composite particles withaverage size of about 10 nm were loaded onto the Pal ¯bers' surface. FexOy acted not only asmagnetic source but also took part in the formation of TiO 2 – FexOy heterojunction structure, which resulted in the obvious absorption in visible light region for the obtained Pal – TiO 2 – FexOy com-posite photocatalyst. The obtained Pal – TiO 2 – FexOy shows excellent photocatalytic activity to-ward photodegradation of Methyl orange (MO) under visible light irradiation and the degradationratio reached 94% within 180 min. Moreover, Pal – TiO 2 – FexOy could be readily recovered from thereaction solution by the magnet. Possible mechanism for the enhancement was also proposed.
Jingrui Ye,Mengjuan Teng,Xingyue Qian,Chao Wan,Guangyu He,Haiqun Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Hydrogen evolution reactions (HER) via water splitting is of significance for electricity-to-fuel conversion. The pursuits of rationally design and facile synthesis method for efficient HER catalysts have long been asubject of interest. In this work, a bimetallic MOF-derived strategy was constructed to realize doping andalloying of transition metal in parallel and Pd-CuCeOx catalyst was prepared, in which Cu served as dopingelement in CeO2 and secondary metal in Pd-Cu alloy. For the as-synthesized Pd-CuCeOx, an overpotentialof 109 mV is needed to reach a current density of 10 mA cm2 with a Tafel slope of only 30.9 mVdec1. With the low content of precious metal, Pd-CuCeOx exhibited a high TOF value of 6.99 s1, which isabout 3.5 times higher than that of commercial Pt/C. The improved HER performance is attributed to thed-band structure modified by alloying and the enhanced electronic coupling caused by doping.